CVE-2019-9500

El controlador Broadcom brcmfmac WiFi antes de commit 1b5e2423164b3670e8bc9174e4762d297990deff, es vulnerable a un desbordamiento del búfer de la pila. Si es configurada la funcionalidad Wake-up on Wireless LAN, una trama de evento malicioso puede ser construida para desencadenar un desbordamiento del búfer de la pila en la función brcmf_wowl_nd_results. Esta vulnerabilidad puede ser explotada con chipsets comprometidos para comprometer el host, o cuando es usada en combinación con CVE-2019-9503, puede ser usada remotamente. En el peor de los casos, mediante el envío de paquetes WiFi especialmente diseñados, un atacante remoto no autenticado puede ejecutar código arbitrario sobre un sistema vulnerable. Más típicamente, esta vulnerabilidad resultará en condiciones de denegación de servicio.

If the Wake-up on Wireless LAN functionality is configured in the brcmfmac driver, which only works with Broadcom FullMAC chipsets, a malicious event frame can be constructed to trigger a heap buffer overflow in the brcmf_wowl_nd_results() function. This vulnerability can be exploited by compromised chipsets to compromise the host, or when used in combination with another brcmfmac driver flaw (CVE-2019-9503), can be used remotely. This can result in a remote denial of service (DoS). Due to the nature of the flaw, a remote privilege escalation cannot be fully ruled out.

This is a kernel live patch module which is automatically loaded by the RPM post-install script to modify the code of a running kernel. Security fix: If the Wake-up on Wireless LAN functionality is configured in the brcmfmac driver, which only works with Broadcom FullMAC chipsets, a malicious event frame can be constructed to trigger a heap buffer overflow in the brcmf_wowl_nd_results() function. This vulnerability can be exploited by compromised chipsets to compromise the host, or when used in combination with another brcmfmac driver flaw, can be used remotely. This can result in a remote denial of service. Due to the nature of the flaw, a remote privilege escalation cannot be fully ruled out. Issues addressed include buffer overflow and denial of service vulnerabilities.